High School Students’ Conceptions about Energy in Chemical Reactions (focusing only in exothermic and endothermic reactions). Aim The aim of this study is to investigate students’ understanding of the energy concept in chemical reactions particularly in endothermic-exothermic reactions. Both qualitative and quantitative methodology was used for this investigation. A twenty-item multiple choice test was developed about the topic to measure the students’ understandings. This concept test was
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Privacy‚ the state of being free from a public attention‚ is a very sensitive and debatable topic in today’s world. What is an invasion of privacy? It is the invasion into another personal life of another individual‚ with no cause. Law enforcement cameras are cameras‚ body worn police cameras‚ and hidden cameras of all types. Closed circuit television‚ also known as surveillance‚ is the use of video cameras to transmit a signal to a specific place or close observation‚ especially of a suspected spy
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Poverty Among Native Americans W.E.B Du Bois once stated “to be a poor man is hard‚ but to be a poor race in a land of dollars is the very bottom of hardships” (qtd. in Rodgers 1). The Native American culture is often overlooked by many people in the United States today. What many people do not realize is that about twenty-five percent of Native Americans are living in poverty (Rodgers 1). A majority of the poverty among Native Americans is due to the United States breaking treaties that promised
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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REACTION PAPER ON THREATS TO NATIONAL SECURITY With the events between the United States of America and Syria leading towards a possible world war‚ never has national security become so vital. There are various factors that pose threats to the sovereignty of our country. Peace talks between President Benigno Aquino III’s administration and the Moro Islamic Liberation Front are once again at a standstill‚ with the MILF having doubts on forging a wealth-sharing deal with the government. The Autonomous
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metals arranged in order of their reactivity based on displacement reactions‚ reduction of their oxides by hydrogen or carbon‚ the relative ease of decomposition of their compounds and reactions with oxygen‚ dilute acids and water. The higher up a metal is in the reactivity series‚ the more reactive it is. In the experiment conducted‚ the three metals‚ magnesium‚ zinc and copper each had to undergo displacement reactions and reactions with water‚ oxygen and dilute acids‚ to arrange them in the order
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Title Experiment 17 Reaction Kinetics- Determination of the Activation Energy of the Reaction Between Oxalic Acid and Potassium Permanganate. Objective To determine the activation energy of the reaction between oxalic acid and potassium permanganate. Theory and Background Activation energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport. In terms of the transition-state
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Coupled Reactions Louella Rose E. Tan‚ Frances May L. Coralde Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Results and Discussion A combustion reaction is a reaction that liberates heat and light. Magnesium is a stable element and reacts violently with evolution of much heat and light. The reason the magnesium burned in carbon dioxide was because it combined with the oxygen in the CO2 leaving elemental carbon behind. CO2(g) C(S) + O2(g)
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history of slavery and the role Native Americans played in it. Snyder’s discussion is centralized around the economic and culture ties slavery participated to in Native American life before and after European introduction into North America. A vial part in understanding the role of slavery to the natives is being able to distinguish why there was a need for slavery to be implemented and to understand how the slaves would be integrated into the societies of the natives.1 From this discussion Snyder
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history of America‚ millions of people have come from all over the world have come to experience the American dream. The United States of America has become such an eye catching place because it strives for opportunity. It is the right to life‚ liberty‚ and pursuit of happiness that creates the opportunity to allow an individual to achieve dreams in life. In the preamble‚ Jefferson states that every man has the right to life. It may be a basic concept‚ but during the time of the Native Americans
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